EP2988362A1 - Gebogener elektrodenstapel und batteriepack damit - Google Patents

Gebogener elektrodenstapel und batteriepack damit Download PDF

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Publication number
EP2988362A1
EP2988362A1 EP14832182.1A EP14832182A EP2988362A1 EP 2988362 A1 EP2988362 A1 EP 2988362A1 EP 14832182 A EP14832182 A EP 14832182A EP 2988362 A1 EP2988362 A1 EP 2988362A1
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EP
European Patent Office
Prior art keywords
electrode
separator
positive electrode
negative electrode
stack
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14832182.1A
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English (en)
French (fr)
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EP2988362B1 (de
EP2988362A4 (de
Inventor
Eun Seok Choi
Shin Hyo CHO
Jae Bin Chung
Dong-Myung Kim
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LG Chem Ltd
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LG Chem Ltd
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Publication date
Priority claimed from KR1020130091176A external-priority patent/KR101746790B1/ko
Priority claimed from KR1020130091237A external-priority patent/KR101587858B1/ko
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Publication of EP2988362A1 publication Critical patent/EP2988362A1/de
Publication of EP2988362A4 publication Critical patent/EP2988362A4/de
Application granted granted Critical
Publication of EP2988362B1 publication Critical patent/EP2988362B1/de
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/025—Electrodes composed of, or comprising, active material with shapes other than plane or cylindrical
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to an electrode stack constituting a lithium secondary battery, and more particularly to a curved electrode stack and a battery pack including the same.
  • the lithium secondary battery is very important to realize such a ubiquitous society.
  • the lithium secondary battery may be manufactured by receiving an electrode stack in a receiving part of a battery case together with an electrolyte and thermally bonding the outer edge of the receiving part.
  • Such an electrode stack may be classified as a stacked type electrode stack configured to have a structure in which positive electrode plates, separator plates, and negative electrode plates, each having a predetermined size, are repeatedly stacked such that the separator plates are disposed respectively between the positive electrode plates and the negative electrode plates, a wound (jelly-roll) type electrode stack configured to have a structure in which a positive electrode sheet, a separator sheet, and a negative electrode sheet, each having a predetermined size, are stacked such that the separator sheet is disposed between the positive electrode sheet and the negative electrode sheet, and then the separator sheet is wound in one direction, or a stacked and folded type electrode stack configured to have a structure in which a predetermined number of stacked type electrode stacks is arranged on a separator sheet, and then the separator sheet is wound in one direction such that the stacked type electrode stacks are stacked.
  • FIG. 1 is a view typically showing a state of an electrode stack, including a positive electrode 1, a separator 2, and a negative electrode 3, configured to have a structure in which the separator 2 is disposed between the positive electrode 1 and the negative electrode 3, and one end of each of the positive electrode 1 and the negative electrode 3 does not intersect the other end of each of the positive electrode 1 and the negative electrode 3, before and after the electrode stack is bent.
  • a structure in which one positive electrode 1, one separator 2, and one negative electrode 3 are stacked is shown in FIG. 1 .
  • the electrode stack may include a plurality of positive electrodes, a plurality of separators, and a plurality of negative electrode.
  • the lengths of the separator 2 and the negative electrode 3 are greater than that of the positive electrode 1 (see A and A').
  • opposite ends of the positive electrode 1, which is located inside the separator 2 and the negative electrode 3 protrude further outward from corresponding ends of the separator 2 and the negative electrode 3 (see A and A').
  • lithium is separated from the electrode stack during charge of the electrode stack, whereby safety of a lithium secondary battery including the curved electrode stack is lowered. This is because a conventional positive electrode, separator, and negative electrode used for a non-curved electrode stack are applied to the curved electrode stack without any change.
  • FIG. 2 is a typical view showing a curved jelly-roll type electrode stack 20.
  • the jelly-roll type electrode stack 20 is bent along an imaginary line X'-X" perpendicular to a direction in which electrode terminals protrude, stress is concentrated on bent opposite ends A' and A" of the jelly-roll type electrode stack 20 with the result that the electrodes of the jelly-roll type electrode stack 20 may be broken.
  • Japanese Patent Application Publication No. 1999-307130 discloses a method of manufacturing a crooked battery by thermally pressing a positive electrode impregnated with an electrolytic solution containing a plasticizer, a negative electrode impregnated with an electrolytic solution containing a plasticizer, and a gel type electrolyte layer impregnated with an electrolytic solution containing a plasticizer using two rolls having different diameters.
  • FIG. 3 shows a crooked electrode stack disclosed in Japanese Patent Application Publication No. 1999-307130 .
  • the electrode stack includes a crooked positive electrode 1 including a positive electrode layer 4 and a positive electrode current collector 5, a crooked negative electrode 2 including a negative electrode layer 6 and a negative electrode current collector 7, and a crooked gel type electrolyte layer 3.
  • a positive electrode terminal 8 is connected to the positive electrode current collector 5, and a negative electrode terminal 9 is connected to the negative electrode current collector 7.
  • the positive electrode terminal 8 and the negative electrode terminal 9 are formed at non-crooked portions of the electrode stack.
  • Japanese Patent Application Publication No. 1999-307130 discloses a technology for solving a conventional problem that the crooked electrode stack returns to the original shape thereof. Protection circuit modules known to date each have a planar structure with no curved surface. In consideration of the fact that no conventional curved protection circuit modules have been proposed, therefore, it is understood that Japanese Patent Application Publication No. 1999-307130 does not disclose or recognize a battery pack having a curved protection circuit module mounted thereto.
  • the curved protection circuit module is applied, a very complicated manufacturing process is needed.
  • components such as an integrated circuit (IC)
  • IC integrated circuit
  • the welding process is very complicated, it is difficult to exhibit desired coupling force, and it is also difficult to manufacture a jig used to mount the curved protection circuit module to a crooked battery cell. Consequently, the curved protection circuit module is limited in its applicability to a battery pack, including a plurality of battery cells, the mass production of which is required.
  • the present invention has been made to solve the above problems and other technical problems that have yet to be resolved, and it is an object of the present invention to provide a battery cell including an electrode stack designed such that opposite ends of a positive electrode are covered by corresponding ends of a separator and a negative electrode even in a state in which all of the positive electrode, the separator, and the negative electrode are curved, whereby safety of the battery cell is improved.
  • an electrode stack including at least one positive electrode, at least one negative electrode, and at least one separator, wherein the positive electrode, the negative electrode, and the separator are stacked such that the separator is disposed between the positive electrode and the negative electrode, one end of each of the positive electrode and the negative electrode does not intersect the other end of each of the positive electrode and the negative electrode, a stacked surface of each of the positive electrode, the negative electrode, and the separator includes a curved surface, and the negative electrode have an arc length equal to or greater than that of the positive electrode while the separator has an arc length greater than that of the positive electrode in a state in which the positive electrode, the negative electrode, and the separator are curved.
  • one end of each of the positive electrode and the negative electrode does not intersect the other end of each of the positive electrode and the negative electrode unlike a jelly-roll type electrode stack configured to have a structure in which a positive electrode sheet and a negative electrode sheet are wound in a state in which the positive electrode sheet and the negative electrode sheet are stacked with the result that one end of each of the positive electrode sheet and the negative electrode sheet intersects the other end of each of the positive electrode sheet and the negative electrode sheet.
  • the negative electrode has a length equal to or greater than that of the curved positive electrode. Specifically, the negative electrode may have a length equivalent to 1.1 to 1.3 times that of the positive electrode.
  • the opposite ends of the curved negative electrode may face corresponding ends of the curved positive electrode in a state in which the separator is disposed between the negative electrode and the positive electrode. In a case in which the opposite ends of the curved negative electrode do not face corresponding ends of the curved positive electrode in a state in which the separator is disposed between the negative electrode and the positive electrode, a short circuit may occur between the positive electrode and the negative electrode.
  • lithium is separated from the electrode stack during charge of the electrode stack, whereby safety of the electrode stack is lowered.
  • the positive electrode may be configured to have a structure in which a positive electrode material is coated on a portion of the positive electrode other than a positive electrode tab
  • the negative electrode may be configured to have a structure in which a negative electrode material is coated on a portion of the negative electrode other than a negative electrode tab.
  • the positive electrode material may include a well-known lithium metal oxide as a positive electrode active material of a lithium secondary battery.
  • the negative electrode material may include a carbon-based material, such as natural graphite, artificial graphite, non-graphitizing carbon, or graphitizing carbon, as a negative electrode active material of the lithium secondary battery.
  • oxidation/reduction potential is about 0.1 V lower than potential of Li/Li+ with the result that lithium may be separated from the electrode stack during charge of the electrode stack. For this reason, the amount of the negative electrode that is loaded may be increased in order to secure a balance between the positive electrode and the negative electrode, or the length of the negative electrode may be designed based on a calculated slippage value of the positive electrode when the positive electrode is bent.
  • the curved electrode stack may be designed such that the negative electrode has an arc length equal to or greater than that of the curved positive electrode, and the separator has an arc length greater than that of the curved positive electrode according to the present invention.
  • the separator may have a length greater than that of the negative electrode and, in addition, a length equivalent to 1.1 to 1.3 times that of the positive electrode.
  • the stacked surface of each of the positive electrode, the negative electrode, and the separator may include a curved surface.
  • the curved surface may have a radius of curvature R of 35 mm to 900 mm.
  • one end of each of the positive electrode, the negative electrode, and the separator may not intersect the other end of each of the positive electrode, the negative electrode, and the separator.
  • the electrode stack may be a stacked type electrode stack.
  • the electrode stack may include at least one improved electrode configured to have a structure in which a separator is laminated to one surface or opposite surfaces of the electrode.
  • the improved electrode may be configured to have a structure in which a separator is laminated to one surface of a positive electrode or a negative electrode.
  • the improved electrode may be configured to have a structure in which separators are laminated to opposite surfaces of a positive electrode or opposite surfaces of a negative electrode.
  • the improved electrode may be configured to have a structure in which a positive electrode, a separator, and a negative electrode are laminated in a state in which the separator is disposed between the positive electrode and the negative electrode.
  • an embodiment example configured to have a structure in which a positive electrode, a separator, and a negative electrode are laminated in a state in which the separator is disposed between the positive electrode and the negative electrode may be defined as an electrode group.
  • the outermost electrodes of the electrode group may have the same polarity or different polarities.
  • the electrode group may be referred to as an S type electrode group.
  • the electrode group may be referred to as a D type electrode group.
  • At least one of the outermost electrodes may be laminated to separators in a state in which the at least one of the outermost electrodes is disposed between the separators.
  • the improved electrode may be configured to have a structure in which one selected from between a positive electrode and a negative electrode is included along with a separator, and one selected from between the positive electrode and the negative electrode is laminated to the separator, which may be referred to as an electrode element.
  • the electrode element may be configured to have a structure in which one selected from between a positive electrode and a negative electrode is laminated to the separators in a state in which one selected from between the positive electrode and the negative electrode is disposed between the separators.
  • the electrode, the improved electrode, the separator, the electrode group, and the electrode element may be combined to constitute an electrode stack having a structure in which a separator is disposed between a positive electrode and a negative electrode, which is included in the scope of the present invention.
  • the electrode stack may include at least one non-curved surface.
  • the non-curved surface may be provided at the stacked surface or at a side surface of the electrode stack which is not parallel to the stacked surface.
  • the side surface may be perpendicular to the stacked surface.
  • Electrode tabs may be formed at the non-curved surface. Both a positive electrode tab and a negative electrode tab may be formed at one non-curved surface. Alternatively, a positive electrode tab may be formed at one non-curved surface, and a negative electrode tab may be formed at the other non-curved surface.
  • the electrode tabs may be connected to electrode leads to constitute electrode terminals, which may be connected to a protection circuit module (PCM).
  • PCM protection circuit module
  • the non-curved surface may be formed at each side surface of the electrode stack that is not parallel to the stacked surface.
  • Each side surface may include one or more non-curved surfaces.
  • Both of the positive electrode tab and the negative electrode tab may be formed at one of the side surfaces.
  • the at least one separator may include a first separator and a second separator.
  • the first separator may be disposed between the positive electrode and the negative electrode in a state in which one end of the first separator does not intersect the other end of the first separator, and the second separator may wrap side surfaces of the electrodes, at which no electrode terminals are formed, while being disposed between the positive electrode and the negative electrode.
  • the second separator is different from the first separator in that one end of the second separator intersects the other end of the second separator.
  • the electrode stack may be a stacked and folded type electrode stack configured to have a structure in which a plurality of stacked type electrode stacks is arranged on a separator sheet, and then the separator sheet is wound or folded in one direction such that the electrode stacks are stacked.
  • the electrode stack may be a wound (jelly-roll) type electrode stack configured to have a structure in which a positive electrode sheet, a separator sheet, and a negative electrode sheet, each having a predetermined size, are stacked such that the separator sheet is disposed between the positive electrode sheet and the negative electrode sheet, and then the separator sheet is wound in one direction.
  • a wound (jelly-roll) type electrode stack configured to have a structure in which a positive electrode sheet, a separator sheet, and a negative electrode sheet, each having a predetermined size, are stacked such that the separator sheet is disposed between the positive electrode sheet and the negative electrode sheet, and then the separator sheet is wound in one direction.
  • a battery cell including the electrode stack with the above-stated construction mounted in a battery case together with an electrolyte.
  • the battery case may be a metal can or a pouch-shaped battery case made of a laminate sheet including a metal layer and a resin layer.
  • the battery case may have a shape corresponding to the curved shape of the electrode stack.
  • the battery cell may be a lithium ion polymer battery, a lithium ion battery, or a lithium polymer battery.
  • Known structures and components of the lithium ion polymer battery, the lithium ion battery, and the lithium polymer battery are herein incorporated by reference.
  • a battery pack including a battery cell including an electrode stack according to claim 1, a non-aqueous electrolyte containing lithium salt, electrode terminals having opposite polarities, and a battery cell case, wherein the electrode stack is received in the battery cell case together with the electrolyte, both of the positive electrode terminal and the negative electrode terminal are formed at a first surface of the battery cell case, and the first surface comprises a first curved surface, and a protection circuit module connected to the positive electrode terminal and the negative electrode terminal, a second surface of the protection circuit module facing the first surface comprising a second curved surface identical to or similar to the first curved surface.
  • the first curved surface and the second curved surface may be similar to each other within a similarity ratio of 1:0.90 to 1:0.99 or 1:1.01 to 1:1.10. In a case in which the similarity ratio of the first curved surface to the second curved surface is 1:1, it may be understood that the first curved surface and the second curved surface are identical to each other.
  • first curved surface may have a radius of curvature R1 of 35 mm to 900 mm
  • second curved surface may have a radius of curvature R2 of 35 mm to 900 mm.
  • the radius of curvature R1 of the first curved surface may be equal to the radius of curvature R2 of the second curved surface.
  • the radius of curvature R1 of the first curved surface may not be equal to the radius of curvature R2 of the second curved surface.
  • the radius of curvature R1 of the first curved surface may be equal to the radius of curvature R2 of the second curved surface.
  • the protection circuit module may be configured to have a printed circuit board structure in which an electric circuit for preventing overcharge or overdischarge and enabling the flow of rated current is printed, the second curved surface is one surface of the printed circuit board, a safety element and a connection terminal are coupled to one surface of the printed circuit board, and the other surface of the printed circuit board comprises an external input and output terminal connected to a predetermined external device.
  • the printed circuit board may be made of a material exhibiting higher flexibility than a general protection circuit module. Components mounted at the printed circuit board may each have one curved surface corresponding to the curved surface of the battery cell such that the components of the printed circuit board can tightly contact the battery cell.
  • the battery pack may be used as a power source for a curved smart phone, a curved mobile phone, a curved laptop computer, a curved tablet PC, a curved clock, a curved television, or curved glasses.
  • FIG. 4 is a view typically showing an electrode stack, including a positive electrode 101, a separator 102, and a negative electrode 103, configured to have a structure in which the separator 102 is disposed between the positive electrode 101 and the negative electrode 103 according to a non-limiting embodiment of the present invention.
  • the electrode stack may include a plurality of positive electrodes, a plurality of separators, and a plurality of negative electrodes. Referring to FIG. 4 , it can be seen that opposite ends of the positive electrode 101 are covered by corresponding ends of the separator 102 and the negative electrode 103 in a state in which all of the positive electrode 101, the separator 102, and the negative electrode 103 are curved.
  • FIGS. 5 and 6 are views showing various embodiment examples of the electrode stack of FIG. 4 .
  • an electrode stack 100 includes a positive electrode 101, a separator 102, and a negative electrode 103.
  • the separator 102 is disposed between the positive electrode 101 and the negative electrode 103.
  • the positive electrode 101 is provided with a positive electrode tab 104 having no positive electrode material applied thereto
  • the negative electrode 103 is provided with a negative electrode tab 105 having no negative electrode material applied thereto.
  • One end of each of the positive electrode 101, the separator 102, and the negative electrode 103 does not intersect the other end of each of the positive electrode 101, the separator 102, and the negative electrode 103.
  • a curved surface is formed at a stacked surface of each of the positive electrode 101, the separator 102, and the negative electrode 103, and non-curved surfaces are formed at two side surfaces that are not parallel to the stacked surface.
  • the positive electrode tab 104 and the negative electrode tab 105 are formed at one of the two side surfaces.
  • the positive electrode tab 104 and the negative electrode tab 105 are coupled to a positive electrode lead (not shown) and a negative electrode lead (not shown) to form a positive electrode terminal and a negative electrode terminal, respectively.
  • opposite ends of the positive electrode 101 may be covered by corresponding ends of the separator 102 and the negative electrode 103 as shown in FIG. 4 . That is, as shown in FIG. 4 , the separator 102 and the negative electrode 103 have larger arc lengths than the positive electrode 101 in a state in which the positive electrode, the negative electrode, and the separator are curved.
  • an electrode stack 200 is configured to have a structure in which the electrode stack 100 of FIG. 5 , including the positive electrode 101, the separator 102, and the negative electrode 103, configured to have a structure in which the separator 102 is disposed between the positive electrode 101 and the negative electrode 103, is arranged on a separator sheet 107, and the separator sheet 107 is wound in one direction such that the separator sheet 107 wraps side surfaces of the electrodes, at which the positive electrode tab 104 and the negative electrode tab 105 are not formed.
  • One end of the separator sheet 107 intersects the other end of the separator sheet 107.
  • opposite ends of the positive electrode 101 may be covered by corresponding ends of the separator 102 and the negative electrode 103 as shown in FIG. 4 .
  • the separator 102 may function as the first separator as previously described, and the separator sheet 107 may function as the second separator as previously described.
  • the electrode stack 100 of FIG. 5 may be a stacked type electrode stack.
  • the electrode stack 100 may include at least one improved electrode configured to have a structure in which the separator 102 is laminated to one surface or opposite surfaces of each of the electrodes 101 and 103.
  • FIG. 7 is a view typically showing a battery pack including a curved protection circuit module according to a non-limiting embodiment of the present invention.
  • the battery pack 500 may include a battery cell 300 including a positive electrode terminal 310 and a negative electrode terminal 320 formed at a first surface 331 of a battery cell case 330 and a protection circuit module 400.
  • the first surface 331 may be curved in an arc shape along an imaginary line Y-Y' passing between the positive electrode terminal 310 and the negative electrode terminal 320.
  • the protection circuit module 400 is configured to have a printed circuit board structure.
  • One surface of the printed circuit board facing the first surface 331 may be a second curved surface identical to or similar to the first surface.
  • a safety element (not shown) and a connection terminal (not shown) may be coupled to one surface of the printed circuit board, and the other surface of the printed circuit board may include an external input and output terminal 410 connected to a predetermined external device.
  • FIG. 8 is a view showing a stacked type electrode stack 200A constituting the battery cell 300 of FIG. 7 .
  • the electrode stack 200A may include a plurality of positive electrodes, a plurality of separators, and a plurality of negative electrodes.
  • the stacked type electrode stack 200A includes a positive electrode 101, a separator 102, and a negative electrode 103.
  • the separator 102 is disposed between the positive electrode 101 and the negative electrode 103.
  • the positive electrode 101 is provided with a positive electrode tab 101A having no positive electrode material applied thereto
  • the negative electrode 103 is provided with a negative electrode tab 103A having no negative electrode material applied thereto.
  • One end of each of the positive electrode 101, the separator 102, and the negative electrode 103 does not intersect the other end of each of the positive electrode 101, the separator 102, and the negative electrode 103.
  • a first surface 230A of the electrode stack 200A is curved in an arc shape along an imaginary line W-W' passing between the positive electrode tab 101A and the negative electrode tab 103A.
  • the positive electrode tab 101A may be coupled to a positive electrode lead (not shown) to form the positive electrode terminal 310
  • the negative electrode tab 103A may be coupled to a negative electrode lead (not shown) to form the negative electrode terminal 320.
  • FIG. 9 is a view showing a jelly-roll type electrode stack 200B constituting the battery cell 300 of FIG. 7 .
  • the jelly-roll type electrode stack 200B of FIG. 9 is configured to have a structure in which a positive electrode tab 101B and a negative electrode tab 103B are formed at one surface 230B of the electrode stack 200B, and the surface 230B is curved in an arc shape along an imaginary line Z-Z' passing between the positive electrode tab 101B and the negative electrode tab 103B.
  • the stacked type electrode stack 200A of FIG. 8 may include at least one improved electrode configured to have a structure in which the separator 102 is laminated to one surface or opposite surfaces of each of the electrodes 101 and 103.
  • An improved electrode configured to have a structure in which a separator is laminated to one surface or opposite surfaces of at least one electrode may have various structures as shown in FIGS. 10 to 14 .
  • the present invention is not limited to the structures shown in FIGS. 10 to 14 .
  • FIG. 10 is a view typically showing a first embodiment example 110 configured to have a structure in which a separator 102 is laminated to one surface of a positive electrode 101.
  • FIG. 11 is a view typically showing a second embodiment example 120 configured to have a structure in which separators 102 are laminated to opposite surfaces of a positive electrode 101.
  • FIG. 12 is a view typically showing a third embodiment example 130 configured to have a structure in which a positive electrode 101, a separator 102, and a negative electrode 103 are laminated in a state in which the separator 102 is disposed between the positive electrode 101 and the negative electrode 103.
  • FIG. 10 is a view typically showing a first embodiment example 110 configured to have a structure in which a separator 102 is laminated to one surface of a positive electrode 101.
  • FIG. 11 is a view typically showing a second embodiment example 120 configured to have a structure in which separators 102 are laminated to opposite surfaces of a positive electrode 101.
  • FIG. 12 is a
  • FIG. 13 is a view typically showing a fourth embodiment example 140 configured to have a structure in which the positive electrode 101, which is one of the outermost electrodes 101 and 103 of the third embodiment example 130 of FIG. 12 , is laminated to separators 102 in a state in which the positive electrode 101 is disposed between the separators 102.
  • FIG. 14 is a view typically showing a fifth embodiment example 150 configured to have a structure in which the outermost electrodes 101 and 103 of the third embodiment example 130 of FIG. 12 are laminated to separators 102 in a state in which the electrodes 101 and 103 are disposed between the separators 102.
  • the second embodiment example 120 may be referred to as an electrode element
  • the third embodiment example 130 may be referred to as an electrode group.
  • the electrode stack 100 may include a combination of a plurality of positive electrodes 101, a plurality of separators 102, a plurality of negative electrodes 103, and one or more selected from a group consisting of a first embodiment example 110, a second embodiment example 120, a third embodiment example 130, a fourth embodiment example 140, and a fifth embodiment example 150.
  • a battery cell according to the present invention includes an electrode stack, including a positive electrode, a negative electrode, and a separator, configured to have a structure in which the negative electrode has an arc length equal to or greater than that of the positive electrode while the separator has an arc length greater than that of the positive electrode in a state in which all of the positive electrode, the negative electrode, and the separator are curved. Consequently, the battery cell according to the present invention exhibits improved safety.
  • a battery pack according to the present invention includes a curved protection circuit module that is capable of minimizing unnecessary waste of an internal space of an electronic device, in which the battery pack is mounted, and exhibiting improved volume energy density characteristics.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Cell Separators (AREA)
EP14832182.1A 2013-07-31 2014-05-08 Gebogener elektrodenstapel und batteriepack damit Active EP2988362B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020130091176A KR101746790B1 (ko) 2013-07-31 2013-07-31 휘어진 형상의 보호회로모듈을 포함하는 전지팩
KR1020130091237A KR101587858B1 (ko) 2013-07-31 2013-07-31 휘어진 형상의 전극 적층체 및 이를 포함하는 전지셀
PCT/KR2014/004098 WO2015016465A1 (ko) 2013-07-31 2014-05-08 휘어진 형상의 전극 적층체 및 이를 포함하는 전지팩

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EP2988362A1 true EP2988362A1 (de) 2016-02-24
EP2988362A4 EP2988362A4 (de) 2017-04-05
EP2988362B1 EP2988362B1 (de) 2020-04-01

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EP (1) EP2988362B1 (de)
JP (1) JP6169789B2 (de)
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WO2015016465A1 (ko) 2015-02-05
US20160133987A1 (en) 2016-05-12
JP6169789B2 (ja) 2017-07-26
CN105247726A (zh) 2016-01-13
EP2988362B1 (de) 2020-04-01
EP2988362A4 (de) 2017-04-05
JP2016525768A (ja) 2016-08-25
US9972868B2 (en) 2018-05-15
CN105247726B (zh) 2018-06-26

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